Email notifications

Hello all,
After checking the log files of my Netsaint I found several messages that 
concerned me. The following errors are of concern:

[1040911666] Warning: Attempting to execute the command "/bin/echo -e 
'***** NetSaint 0.0.6 *****\n\nNotification Type: PROBLEM\n\nService: 
ping\nHost: 90905-100228\nAddress: 148.70.80.0\nState: 
CRITICAL\n\nDate/Time: Thu Dec 26 09:07:46 EST 2002\n\nAdditional 
Info:\n\nCRITICAL - Plugin timed out after 15 seconds' |   -s '** PROBLEM 
alert - 90905-100228/ping is CRITICAL **' [email protected]" resulted 
in a return code of 127.  Make sure the script or binary you are trying to 
execute actually exists...

Warning: Attempting to execute the command "/bin/echo -e '***** NetSaint 
0.0.6 *****\n\nNotification Type: RECOVERY\n\nService: ping\nHost: 
90905-100228\nAddress: 148.70.80.0\nState: OK\n\nDate/Time: Thu Dec 26 
09:12:36 EST 2002\n\nAdditional Info:\n\nPING OK - Packet loss = 0%, RTA = 
881.95 ms' |   -s '** RECOVERY alert - 90905-100228/ping is OK **' 
[email protected]" resulted in a return code of 127.  Make sure the 
script or binary you are trying to execute actually exists...

Can anyone help me with this. I have had Netsaint running for several 
weeks and have never figured out how to actually get the email 
notifications to work. Does anyone have suggestions?

Any help would be greatly appreciated.

Mike